American Shifter company's adapter kits allow you to install your shift knob with ease. You can simply insert the correct adapter and screw onto your shift lever. It comes in 2 kits as standard or metric. It includes one 16 millimeter x 1.5 to 7 millimeter x 1 adapter, one 16 millimeter x 1.5 to 8 millimeter x 1.5 adapter, one 16 millimeter x 1.5 to 8 millimeter x 1.25 adapter, one 16 millimeter x 1.5 to 10 millimeter x 1.5 adapter, one 16 millimeter x 1.5 to 10 millimeter x 1.25 adapter, one 16 millimeter x 1.5 to 12 millimeter x 1.5 adapter, one 16 millimeter x 1.5 to 12 millimeter x 1.25 adapter and one 16 millimeter x 1.5 to 12 millimeter x 1.75 adapter.